Re: [PATCH v3 00/21] mm: lru_lock splitting

[KAMEZAWA Hiroyuki]

On Thu, 23 Feb 2012 17:51:36 +0400
Konstantin Khlebnikov <khlebnikov@xxxxxxxxxx> wrote:

> v3 changes:
> * inactive-ratio reworked again, now it always calculated from from scratch
> * hierarchical pte reference bits filter in memory-cgroup reclaimer
> * fixed two bugs in locking, found by Hugh Dickins
> * locking functions slightly simplified
> * new patch for isolated pages accounting
> * new patch with lru interleaving
> 
> This patchset is based on next-20120210
> 
> git: https://github.com/koct9i/linux/commits/lruvec-v3
> 

I wonder.... I just wonder...if we can split a lruvec in a zone into small
pieces of lruvec and have splitted LRU-lock per them, do we need per-memcg-lrulock ?

It seems per-memcg-lrulock can be much bigger lock than small-lruvec-lock.
(depends on configuraton) and much more complicated..and have to take care
of many things.. If unit of splitting can be specified by boot option,
it seems admins can split a big memcg's per-memcg-lru lock into more small pieces.

BTW, how to think of default size of splitting ? I wonder splitting lru into
the number of cpus per a node can be a choice. Each cpu may have a chance to
set prefered-pfn-range at page allocation with additional patches.

Thanks,
-Kame


> ---
> 
> Konstantin Khlebnikov (21):
>       memcg: unify inactive_ratio calculation
>       memcg: make mm_match_cgroup() hirarchical
>       memcg: fix page_referencies cgroup filter on global reclaim
>       memcg: use vm_swappiness from target memory cgroup
>       mm: rename lruvec->lists into lruvec->pages_lru
>       mm: lruvec linking functions
>       mm: add lruvec->pages_count
>       mm: unify inactive_list_is_low()
>       mm: add lruvec->reclaim_stat
>       mm: kill struct mem_cgroup_zone
>       mm: move page-to-lruvec translation upper
>       mm: push lruvec into update_page_reclaim_stat()
>       mm: push lruvecs from pagevec_lru_move_fn() to iterator
>       mm: introduce lruvec locking primitives
>       mm: handle lruvec relocks on lumpy reclaim
>       mm: handle lruvec relocks in compaction
>       mm: handle lruvec relock in memory controller
>       mm: add to lruvec isolated pages counters
>       memcg: check lru vectors emptiness in pre-destroy
>       mm: split zone->lru_lock
>       mm: zone lru vectors interleaving
> 
> 
>  include/linux/huge_mm.h    |    3 
>  include/linux/memcontrol.h |   75 ------
>  include/linux/mm.h         |   66 +++++
>  include/linux/mm_inline.h  |   19 +-
>  include/linux/mmzone.h     |   39 ++-
>  include/linux/swap.h       |    6 
>  mm/Kconfig                 |   16 +
>  mm/compaction.c            |   31 +--
>  mm/huge_memory.c           |   14 +
>  mm/internal.h              |  204 +++++++++++++++++
>  mm/ksm.c                   |    2 
>  mm/memcontrol.c            |  343 +++++++++++-----------------
>  mm/migrate.c               |    2 
>  mm/page_alloc.c            |   70 +-----
>  mm/rmap.c                  |    2 
>  mm/swap.c                  |  217 ++++++++++--------
>  mm/vmscan.c                |  534 ++++++++++++++++++++++++--------------------
>  mm/vmstat.c                |    6 
>  18 files changed, 932 insertions(+), 717 deletions(-)
> 
> -- 
> Signature
> 

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